Wiring Harnesses If the wiring in your Chevy or GMC truck is cracked, patched with electrical tape or has new wiring spliced in, it definitely needs to be replaced. You'll eventually have problems with burned out electrical equipment or even worse, an electrical fire.. I need a instrument cluster wiring diagram for a 1979 chevy custom 20 - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.. Wiring Harness Diagram For 1984 Chevy Truck The Wiring Diagram At, size: 800 x 600 px, source: gooddy.org Whatever you are, we try to bring the material that matches just what you are trying to find. You could come from an online search engine, then locate this web site..